1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * IBSS mode implementation 4 * Copyright 2003-2008, Jouni Malinen <j@w1.fi> 5 * Copyright 2004, Instant802 Networks, Inc. 6 * Copyright 2005, Devicescape Software, Inc. 7 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 8 * Copyright 2007, Michael Wu <flamingice@sourmilk.net> 9 * Copyright 2009, Johannes Berg <johannes@sipsolutions.net> 10 * Copyright 2013-2014 Intel Mobile Communications GmbH 11 * Copyright(c) 2016 Intel Deutschland GmbH 12 * Copyright(c) 2018-2023 Intel Corporation 13 */ 14 15 #include <linux/delay.h> 16 #include <linux/slab.h> 17 #include <linux/if_ether.h> 18 #include <linux/skbuff.h> 19 #include <linux/if_arp.h> 20 #include <linux/etherdevice.h> 21 #include <linux/rtnetlink.h> 22 #include <net/mac80211.h> 23 24 #include "ieee80211_i.h" 25 #include "driver-ops.h" 26 #include "rate.h" 27 28 #define IEEE80211_SCAN_INTERVAL (2 * HZ) 29 #define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ) 30 31 #define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ) 32 #define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ) 33 #define IEEE80211_IBSS_RSN_INACTIVITY_LIMIT (10 * HZ) 34 35 #define IEEE80211_IBSS_MAX_STA_ENTRIES 128 36 37 static struct beacon_data * 38 ieee80211_ibss_build_presp(struct ieee80211_sub_if_data *sdata, 39 const int beacon_int, const u32 basic_rates, 40 const u16 capability, u64 tsf, 41 struct cfg80211_chan_def *chandef, 42 bool *have_higher_than_11mbit, 43 struct cfg80211_csa_settings *csa_settings) 44 { 45 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 46 struct ieee80211_local *local = sdata->local; 47 int rates_n = 0, i, ri; 48 struct ieee80211_mgmt *mgmt; 49 u8 *pos; 50 struct ieee80211_supported_band *sband; 51 u32 rate_flags, rates = 0, rates_added = 0; 52 struct beacon_data *presp; 53 int frame_len; 54 int shift; 55 56 /* Build IBSS probe response */ 57 frame_len = sizeof(struct ieee80211_hdr_3addr) + 58 12 /* struct ieee80211_mgmt.u.beacon */ + 59 2 + IEEE80211_MAX_SSID_LEN /* max SSID */ + 60 2 + 8 /* max Supported Rates */ + 61 3 /* max DS params */ + 62 4 /* IBSS params */ + 63 5 /* Channel Switch Announcement */ + 64 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 65 2 + sizeof(struct ieee80211_ht_cap) + 66 2 + sizeof(struct ieee80211_ht_operation) + 67 2 + sizeof(struct ieee80211_vht_cap) + 68 2 + sizeof(struct ieee80211_vht_operation) + 69 ifibss->ie_len; 70 presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL); 71 if (!presp) 72 return NULL; 73 74 presp->head = (void *)(presp + 1); 75 76 mgmt = (void *) presp->head; 77 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 78 IEEE80211_STYPE_PROBE_RESP); 79 eth_broadcast_addr(mgmt->da); 80 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 81 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN); 82 mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int); 83 mgmt->u.beacon.timestamp = cpu_to_le64(tsf); 84 mgmt->u.beacon.capab_info = cpu_to_le16(capability); 85 86 pos = (u8 *)mgmt + offsetof(struct ieee80211_mgmt, u.beacon.variable); 87 88 *pos++ = WLAN_EID_SSID; 89 *pos++ = ifibss->ssid_len; 90 memcpy(pos, ifibss->ssid, ifibss->ssid_len); 91 pos += ifibss->ssid_len; 92 93 sband = local->hw.wiphy->bands[chandef->chan->band]; 94 rate_flags = ieee80211_chandef_rate_flags(chandef); 95 shift = ieee80211_chandef_get_shift(chandef); 96 rates_n = 0; 97 if (have_higher_than_11mbit) 98 *have_higher_than_11mbit = false; 99 100 for (i = 0; i < sband->n_bitrates; i++) { 101 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 102 continue; 103 if (sband->bitrates[i].bitrate > 110 && 104 have_higher_than_11mbit) 105 *have_higher_than_11mbit = true; 106 107 rates |= BIT(i); 108 rates_n++; 109 } 110 111 *pos++ = WLAN_EID_SUPP_RATES; 112 *pos++ = min_t(int, 8, rates_n); 113 for (ri = 0; ri < sband->n_bitrates; ri++) { 114 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 115 5 * (1 << shift)); 116 u8 basic = 0; 117 if (!(rates & BIT(ri))) 118 continue; 119 120 if (basic_rates & BIT(ri)) 121 basic = 0x80; 122 *pos++ = basic | (u8) rate; 123 if (++rates_added == 8) { 124 ri++; /* continue at next rate for EXT_SUPP_RATES */ 125 break; 126 } 127 } 128 129 if (sband->band == NL80211_BAND_2GHZ) { 130 *pos++ = WLAN_EID_DS_PARAMS; 131 *pos++ = 1; 132 *pos++ = ieee80211_frequency_to_channel( 133 chandef->chan->center_freq); 134 } 135 136 *pos++ = WLAN_EID_IBSS_PARAMS; 137 *pos++ = 2; 138 /* FIX: set ATIM window based on scan results */ 139 *pos++ = 0; 140 *pos++ = 0; 141 142 if (csa_settings) { 143 *pos++ = WLAN_EID_CHANNEL_SWITCH; 144 *pos++ = 3; 145 *pos++ = csa_settings->block_tx ? 1 : 0; 146 *pos++ = ieee80211_frequency_to_channel( 147 csa_settings->chandef.chan->center_freq); 148 presp->cntdwn_counter_offsets[0] = (pos - presp->head); 149 *pos++ = csa_settings->count; 150 presp->cntdwn_current_counter = csa_settings->count; 151 } 152 153 /* put the remaining rates in WLAN_EID_EXT_SUPP_RATES */ 154 if (rates_n > 8) { 155 *pos++ = WLAN_EID_EXT_SUPP_RATES; 156 *pos++ = rates_n - 8; 157 for (; ri < sband->n_bitrates; ri++) { 158 int rate = DIV_ROUND_UP(sband->bitrates[ri].bitrate, 159 5 * (1 << shift)); 160 u8 basic = 0; 161 if (!(rates & BIT(ri))) 162 continue; 163 164 if (basic_rates & BIT(ri)) 165 basic = 0x80; 166 *pos++ = basic | (u8) rate; 167 } 168 } 169 170 if (ifibss->ie_len) { 171 memcpy(pos, ifibss->ie, ifibss->ie_len); 172 pos += ifibss->ie_len; 173 } 174 175 /* add HT capability and information IEs */ 176 if (chandef->width != NL80211_CHAN_WIDTH_20_NOHT && 177 chandef->width != NL80211_CHAN_WIDTH_5 && 178 chandef->width != NL80211_CHAN_WIDTH_10 && 179 sband->ht_cap.ht_supported) { 180 struct ieee80211_sta_ht_cap ht_cap; 181 182 memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); 183 ieee80211_apply_htcap_overrides(sdata, &ht_cap); 184 185 pos = ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); 186 /* 187 * Note: According to 802.11n-2009 9.13.3.1, HT Protection 188 * field and RIFS Mode are reserved in IBSS mode, therefore 189 * keep them at 0 190 */ 191 pos = ieee80211_ie_build_ht_oper(pos, &sband->ht_cap, 192 chandef, 0, false); 193 194 /* add VHT capability and information IEs */ 195 if (chandef->width != NL80211_CHAN_WIDTH_20 && 196 chandef->width != NL80211_CHAN_WIDTH_40 && 197 sband->vht_cap.vht_supported) { 198 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, 199 sband->vht_cap.cap); 200 pos = ieee80211_ie_build_vht_oper(pos, &sband->vht_cap, 201 chandef); 202 } 203 } 204 205 if (local->hw.queues >= IEEE80211_NUM_ACS) 206 pos = ieee80211_add_wmm_info_ie(pos, 0); /* U-APSD not in use */ 207 208 presp->head_len = pos - presp->head; 209 if (WARN_ON(presp->head_len > frame_len)) 210 goto error; 211 212 return presp; 213 error: 214 kfree(presp); 215 return NULL; 216 } 217 218 static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 219 const u8 *bssid, const int beacon_int, 220 struct cfg80211_chan_def *req_chandef, 221 const u32 basic_rates, 222 const u16 capability, u64 tsf, 223 bool creator) 224 { 225 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 226 struct ieee80211_local *local = sdata->local; 227 struct ieee80211_mgmt *mgmt; 228 struct cfg80211_bss *bss; 229 u64 bss_change; 230 struct cfg80211_chan_def chandef; 231 struct ieee80211_channel *chan; 232 struct beacon_data *presp; 233 struct cfg80211_inform_bss bss_meta = {}; 234 bool have_higher_than_11mbit; 235 bool radar_required; 236 int err; 237 238 lockdep_assert_wiphy(local->hw.wiphy); 239 240 /* Reset own TSF to allow time synchronization work. */ 241 drv_reset_tsf(local, sdata); 242 243 if (!ether_addr_equal(ifibss->bssid, bssid)) 244 sta_info_flush(sdata); 245 246 /* if merging, indicate to driver that we leave the old IBSS */ 247 if (sdata->vif.cfg.ibss_joined) { 248 sdata->vif.cfg.ibss_joined = false; 249 sdata->vif.cfg.ibss_creator = false; 250 sdata->vif.bss_conf.enable_beacon = false; 251 netif_carrier_off(sdata->dev); 252 ieee80211_bss_info_change_notify(sdata, 253 BSS_CHANGED_IBSS | 254 BSS_CHANGED_BEACON_ENABLED); 255 drv_leave_ibss(local, sdata); 256 } 257 258 presp = sdata_dereference(ifibss->presp, sdata); 259 RCU_INIT_POINTER(ifibss->presp, NULL); 260 if (presp) 261 kfree_rcu(presp, rcu_head); 262 263 /* make a copy of the chandef, it could be modified below. */ 264 chandef = *req_chandef; 265 chan = chandef.chan; 266 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef, 267 NL80211_IFTYPE_ADHOC)) { 268 if (chandef.width == NL80211_CHAN_WIDTH_5 || 269 chandef.width == NL80211_CHAN_WIDTH_10 || 270 chandef.width == NL80211_CHAN_WIDTH_20_NOHT || 271 chandef.width == NL80211_CHAN_WIDTH_20) { 272 sdata_info(sdata, 273 "Failed to join IBSS, beacons forbidden\n"); 274 return; 275 } 276 chandef.width = NL80211_CHAN_WIDTH_20; 277 chandef.center_freq1 = chan->center_freq; 278 /* check again for downgraded chandef */ 279 if (!cfg80211_reg_can_beacon(local->hw.wiphy, &chandef, 280 NL80211_IFTYPE_ADHOC)) { 281 sdata_info(sdata, 282 "Failed to join IBSS, beacons forbidden\n"); 283 return; 284 } 285 } 286 287 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 288 &chandef, NL80211_IFTYPE_ADHOC); 289 if (err < 0) { 290 sdata_info(sdata, 291 "Failed to join IBSS, invalid chandef\n"); 292 return; 293 } 294 if (err > 0 && !ifibss->userspace_handles_dfs) { 295 sdata_info(sdata, 296 "Failed to join IBSS, DFS channel without control program\n"); 297 return; 298 } 299 300 radar_required = err; 301 302 if (ieee80211_link_use_channel(&sdata->deflink, &chandef, 303 ifibss->fixed_channel ? 304 IEEE80211_CHANCTX_SHARED : 305 IEEE80211_CHANCTX_EXCLUSIVE)) { 306 sdata_info(sdata, "Failed to join IBSS, no channel context\n"); 307 return; 308 } 309 sdata->deflink.radar_required = radar_required; 310 311 memcpy(ifibss->bssid, bssid, ETH_ALEN); 312 313 presp = ieee80211_ibss_build_presp(sdata, beacon_int, basic_rates, 314 capability, tsf, &chandef, 315 &have_higher_than_11mbit, NULL); 316 if (!presp) 317 return; 318 319 rcu_assign_pointer(ifibss->presp, presp); 320 mgmt = (void *)presp->head; 321 322 sdata->vif.bss_conf.enable_beacon = true; 323 sdata->vif.bss_conf.beacon_int = beacon_int; 324 sdata->vif.bss_conf.basic_rates = basic_rates; 325 sdata->vif.cfg.ssid_len = ifibss->ssid_len; 326 memcpy(sdata->vif.cfg.ssid, ifibss->ssid, ifibss->ssid_len); 327 bss_change = BSS_CHANGED_BEACON_INT; 328 bss_change |= ieee80211_reset_erp_info(sdata); 329 bss_change |= BSS_CHANGED_BSSID; 330 bss_change |= BSS_CHANGED_BEACON; 331 bss_change |= BSS_CHANGED_BEACON_ENABLED; 332 bss_change |= BSS_CHANGED_BASIC_RATES; 333 bss_change |= BSS_CHANGED_HT; 334 bss_change |= BSS_CHANGED_IBSS; 335 bss_change |= BSS_CHANGED_SSID; 336 337 /* 338 * In 5 GHz/802.11a, we can always use short slot time. 339 * (IEEE 802.11-2012 18.3.8.7) 340 * 341 * In 2.4GHz, we must always use long slots in IBSS for compatibility 342 * reasons. 343 * (IEEE 802.11-2012 19.4.5) 344 * 345 * HT follows these specifications (IEEE 802.11-2012 20.3.18) 346 */ 347 sdata->vif.bss_conf.use_short_slot = chan->band == NL80211_BAND_5GHZ; 348 bss_change |= BSS_CHANGED_ERP_SLOT; 349 350 /* cf. IEEE 802.11 9.2.12 */ 351 sdata->deflink.operating_11g_mode = 352 chan->band == NL80211_BAND_2GHZ && have_higher_than_11mbit; 353 354 ieee80211_set_wmm_default(&sdata->deflink, true, false); 355 356 sdata->vif.cfg.ibss_joined = true; 357 sdata->vif.cfg.ibss_creator = creator; 358 359 err = drv_join_ibss(local, sdata); 360 if (err) { 361 sdata->vif.cfg.ibss_joined = false; 362 sdata->vif.cfg.ibss_creator = false; 363 sdata->vif.bss_conf.enable_beacon = false; 364 sdata->vif.cfg.ssid_len = 0; 365 RCU_INIT_POINTER(ifibss->presp, NULL); 366 kfree_rcu(presp, rcu_head); 367 ieee80211_link_release_channel(&sdata->deflink); 368 sdata_info(sdata, "Failed to join IBSS, driver failure: %d\n", 369 err); 370 return; 371 } 372 373 ieee80211_bss_info_change_notify(sdata, bss_change); 374 375 ifibss->state = IEEE80211_IBSS_MLME_JOINED; 376 mod_timer(&ifibss->timer, 377 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 378 379 bss_meta.chan = chan; 380 bss_meta.scan_width = cfg80211_chandef_to_scan_width(&chandef); 381 bss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta, mgmt, 382 presp->head_len, GFP_KERNEL); 383 384 cfg80211_put_bss(local->hw.wiphy, bss); 385 netif_carrier_on(sdata->dev); 386 cfg80211_ibss_joined(sdata->dev, ifibss->bssid, chan, GFP_KERNEL); 387 } 388 389 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata, 390 struct ieee80211_bss *bss) 391 { 392 struct cfg80211_bss *cbss = 393 container_of((void *)bss, struct cfg80211_bss, priv); 394 struct ieee80211_supported_band *sband; 395 struct cfg80211_chan_def chandef; 396 u32 basic_rates; 397 int i, j; 398 u16 beacon_int = cbss->beacon_interval; 399 const struct cfg80211_bss_ies *ies; 400 enum nl80211_channel_type chan_type; 401 u64 tsf; 402 u32 rate_flags; 403 int shift; 404 405 lockdep_assert_wiphy(sdata->local->hw.wiphy); 406 407 if (beacon_int < 10) 408 beacon_int = 10; 409 410 switch (sdata->u.ibss.chandef.width) { 411 case NL80211_CHAN_WIDTH_20_NOHT: 412 case NL80211_CHAN_WIDTH_20: 413 case NL80211_CHAN_WIDTH_40: 414 chan_type = cfg80211_get_chandef_type(&sdata->u.ibss.chandef); 415 cfg80211_chandef_create(&chandef, cbss->channel, chan_type); 416 break; 417 case NL80211_CHAN_WIDTH_5: 418 case NL80211_CHAN_WIDTH_10: 419 cfg80211_chandef_create(&chandef, cbss->channel, 420 NL80211_CHAN_NO_HT); 421 chandef.width = sdata->u.ibss.chandef.width; 422 break; 423 case NL80211_CHAN_WIDTH_80: 424 case NL80211_CHAN_WIDTH_80P80: 425 case NL80211_CHAN_WIDTH_160: 426 chandef = sdata->u.ibss.chandef; 427 chandef.chan = cbss->channel; 428 break; 429 default: 430 /* fall back to 20 MHz for unsupported modes */ 431 cfg80211_chandef_create(&chandef, cbss->channel, 432 NL80211_CHAN_NO_HT); 433 break; 434 } 435 436 sband = sdata->local->hw.wiphy->bands[cbss->channel->band]; 437 rate_flags = ieee80211_chandef_rate_flags(&sdata->u.ibss.chandef); 438 shift = ieee80211_vif_get_shift(&sdata->vif); 439 440 basic_rates = 0; 441 442 for (i = 0; i < bss->supp_rates_len; i++) { 443 int rate = bss->supp_rates[i] & 0x7f; 444 bool is_basic = !!(bss->supp_rates[i] & 0x80); 445 446 for (j = 0; j < sband->n_bitrates; j++) { 447 int brate; 448 if ((rate_flags & sband->bitrates[j].flags) 449 != rate_flags) 450 continue; 451 452 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate, 453 5 * (1 << shift)); 454 if (brate == rate) { 455 if (is_basic) 456 basic_rates |= BIT(j); 457 break; 458 } 459 } 460 } 461 462 rcu_read_lock(); 463 ies = rcu_dereference(cbss->ies); 464 tsf = ies->tsf; 465 rcu_read_unlock(); 466 467 __ieee80211_sta_join_ibss(sdata, cbss->bssid, 468 beacon_int, 469 &chandef, 470 basic_rates, 471 cbss->capability, 472 tsf, false); 473 } 474 475 int ieee80211_ibss_csa_beacon(struct ieee80211_sub_if_data *sdata, 476 struct cfg80211_csa_settings *csa_settings, 477 u64 *changed) 478 { 479 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 480 struct beacon_data *presp, *old_presp; 481 struct cfg80211_bss *cbss; 482 const struct cfg80211_bss_ies *ies; 483 u16 capability = WLAN_CAPABILITY_IBSS; 484 u64 tsf; 485 486 lockdep_assert_wiphy(sdata->local->hw.wiphy); 487 488 if (ifibss->privacy) 489 capability |= WLAN_CAPABILITY_PRIVACY; 490 491 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, ifibss->chandef.chan, 492 ifibss->bssid, ifibss->ssid, 493 ifibss->ssid_len, IEEE80211_BSS_TYPE_IBSS, 494 IEEE80211_PRIVACY(ifibss->privacy)); 495 496 if (WARN_ON(!cbss)) 497 return -EINVAL; 498 499 rcu_read_lock(); 500 ies = rcu_dereference(cbss->ies); 501 tsf = ies->tsf; 502 rcu_read_unlock(); 503 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 504 505 old_presp = sdata_dereference(ifibss->presp, sdata); 506 507 presp = ieee80211_ibss_build_presp(sdata, 508 sdata->vif.bss_conf.beacon_int, 509 sdata->vif.bss_conf.basic_rates, 510 capability, tsf, &ifibss->chandef, 511 NULL, csa_settings); 512 if (!presp) 513 return -ENOMEM; 514 515 rcu_assign_pointer(ifibss->presp, presp); 516 if (old_presp) 517 kfree_rcu(old_presp, rcu_head); 518 519 *changed |= BSS_CHANGED_BEACON; 520 return 0; 521 } 522 523 int ieee80211_ibss_finish_csa(struct ieee80211_sub_if_data *sdata, u64 *changed) 524 { 525 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 526 struct cfg80211_bss *cbss; 527 528 lockdep_assert_wiphy(sdata->local->hw.wiphy); 529 530 /* When not connected/joined, sending CSA doesn't make sense. */ 531 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED) 532 return -ENOLINK; 533 534 /* update cfg80211 bss information with the new channel */ 535 if (!is_zero_ether_addr(ifibss->bssid)) { 536 cbss = cfg80211_get_bss(sdata->local->hw.wiphy, 537 ifibss->chandef.chan, 538 ifibss->bssid, ifibss->ssid, 539 ifibss->ssid_len, 540 IEEE80211_BSS_TYPE_IBSS, 541 IEEE80211_PRIVACY(ifibss->privacy)); 542 /* XXX: should not really modify cfg80211 data */ 543 if (cbss) { 544 cbss->channel = sdata->deflink.csa_chandef.chan; 545 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 546 } 547 } 548 549 ifibss->chandef = sdata->deflink.csa_chandef; 550 551 /* generate the beacon */ 552 return ieee80211_ibss_csa_beacon(sdata, NULL, changed); 553 } 554 555 void ieee80211_ibss_stop(struct ieee80211_sub_if_data *sdata) 556 { 557 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 558 559 wiphy_work_cancel(sdata->local->hw.wiphy, 560 &ifibss->csa_connection_drop_work); 561 } 562 563 static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta) 564 __acquires(RCU) 565 { 566 struct ieee80211_sub_if_data *sdata = sta->sdata; 567 u8 addr[ETH_ALEN]; 568 569 memcpy(addr, sta->sta.addr, ETH_ALEN); 570 571 ibss_dbg(sdata, "Adding new IBSS station %pM\n", addr); 572 573 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH); 574 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC); 575 /* authorize the station only if the network is not RSN protected. If 576 * not wait for the userspace to authorize it */ 577 if (!sta->sdata->u.ibss.control_port) 578 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED); 579 580 rate_control_rate_init(sta); 581 582 /* If it fails, maybe we raced another insertion? */ 583 if (sta_info_insert_rcu(sta)) 584 return sta_info_get(sdata, addr); 585 return sta; 586 } 587 588 static struct sta_info * 589 ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata, const u8 *bssid, 590 const u8 *addr, u32 supp_rates) 591 __acquires(RCU) 592 { 593 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 594 struct ieee80211_local *local = sdata->local; 595 struct sta_info *sta; 596 struct ieee80211_chanctx_conf *chanctx_conf; 597 struct ieee80211_supported_band *sband; 598 enum nl80211_bss_scan_width scan_width; 599 int band; 600 601 /* 602 * XXX: Consider removing the least recently used entry and 603 * allow new one to be added. 604 */ 605 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 606 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 607 sdata->name, addr); 608 rcu_read_lock(); 609 return NULL; 610 } 611 612 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) { 613 rcu_read_lock(); 614 return NULL; 615 } 616 617 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) { 618 rcu_read_lock(); 619 return NULL; 620 } 621 622 rcu_read_lock(); 623 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 624 if (WARN_ON_ONCE(!chanctx_conf)) 625 return NULL; 626 band = chanctx_conf->def.chan->band; 627 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); 628 rcu_read_unlock(); 629 630 sta = sta_info_alloc(sdata, addr, GFP_KERNEL); 631 if (!sta) { 632 rcu_read_lock(); 633 return NULL; 634 } 635 636 /* make sure mandatory rates are always added */ 637 sband = local->hw.wiphy->bands[band]; 638 sta->sta.deflink.supp_rates[band] = supp_rates | 639 ieee80211_mandatory_rates(sband, scan_width); 640 641 return ieee80211_ibss_finish_sta(sta); 642 } 643 644 static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata) 645 { 646 struct ieee80211_local *local = sdata->local; 647 int active = 0; 648 struct sta_info *sta; 649 650 lockdep_assert_wiphy(sdata->local->hw.wiphy); 651 652 rcu_read_lock(); 653 654 list_for_each_entry_rcu(sta, &local->sta_list, list) { 655 unsigned long last_active = ieee80211_sta_last_active(sta); 656 657 if (sta->sdata == sdata && 658 time_is_after_jiffies(last_active + 659 IEEE80211_IBSS_MERGE_INTERVAL)) { 660 active++; 661 break; 662 } 663 } 664 665 rcu_read_unlock(); 666 667 return active; 668 } 669 670 static void ieee80211_ibss_disconnect(struct ieee80211_sub_if_data *sdata) 671 { 672 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 673 struct ieee80211_local *local = sdata->local; 674 struct cfg80211_bss *cbss; 675 struct beacon_data *presp; 676 struct sta_info *sta; 677 678 lockdep_assert_wiphy(local->hw.wiphy); 679 680 if (!is_zero_ether_addr(ifibss->bssid)) { 681 cbss = cfg80211_get_bss(local->hw.wiphy, ifibss->chandef.chan, 682 ifibss->bssid, ifibss->ssid, 683 ifibss->ssid_len, 684 IEEE80211_BSS_TYPE_IBSS, 685 IEEE80211_PRIVACY(ifibss->privacy)); 686 687 if (cbss) { 688 cfg80211_unlink_bss(local->hw.wiphy, cbss); 689 cfg80211_put_bss(sdata->local->hw.wiphy, cbss); 690 } 691 } 692 693 ifibss->state = IEEE80211_IBSS_MLME_SEARCH; 694 695 sta_info_flush(sdata); 696 697 spin_lock_bh(&ifibss->incomplete_lock); 698 while (!list_empty(&ifibss->incomplete_stations)) { 699 sta = list_first_entry(&ifibss->incomplete_stations, 700 struct sta_info, list); 701 list_del(&sta->list); 702 spin_unlock_bh(&ifibss->incomplete_lock); 703 704 sta_info_free(local, sta); 705 spin_lock_bh(&ifibss->incomplete_lock); 706 } 707 spin_unlock_bh(&ifibss->incomplete_lock); 708 709 netif_carrier_off(sdata->dev); 710 711 sdata->vif.cfg.ibss_joined = false; 712 sdata->vif.cfg.ibss_creator = false; 713 sdata->vif.bss_conf.enable_beacon = false; 714 sdata->vif.cfg.ssid_len = 0; 715 716 /* remove beacon */ 717 presp = sdata_dereference(ifibss->presp, sdata); 718 RCU_INIT_POINTER(sdata->u.ibss.presp, NULL); 719 if (presp) 720 kfree_rcu(presp, rcu_head); 721 722 clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state); 723 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON_ENABLED | 724 BSS_CHANGED_IBSS); 725 drv_leave_ibss(local, sdata); 726 ieee80211_link_release_channel(&sdata->deflink); 727 } 728 729 static void ieee80211_csa_connection_drop_work(struct wiphy *wiphy, 730 struct wiphy_work *work) 731 { 732 struct ieee80211_sub_if_data *sdata = 733 container_of(work, struct ieee80211_sub_if_data, 734 u.ibss.csa_connection_drop_work); 735 736 ieee80211_ibss_disconnect(sdata); 737 synchronize_rcu(); 738 skb_queue_purge(&sdata->skb_queue); 739 740 /* trigger a scan to find another IBSS network to join */ 741 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work); 742 } 743 744 static void ieee80211_ibss_csa_mark_radar(struct ieee80211_sub_if_data *sdata) 745 { 746 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 747 int err; 748 749 /* if the current channel is a DFS channel, mark the channel as 750 * unavailable. 751 */ 752 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 753 &ifibss->chandef, 754 NL80211_IFTYPE_ADHOC); 755 if (err > 0) 756 cfg80211_radar_event(sdata->local->hw.wiphy, &ifibss->chandef, 757 GFP_ATOMIC); 758 } 759 760 static bool 761 ieee80211_ibss_process_chanswitch(struct ieee80211_sub_if_data *sdata, 762 struct ieee802_11_elems *elems, 763 bool beacon) 764 { 765 struct cfg80211_csa_settings params; 766 struct ieee80211_csa_ie csa_ie; 767 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 768 enum nl80211_channel_type ch_type; 769 int err; 770 ieee80211_conn_flags_t conn_flags; 771 u32 vht_cap_info = 0; 772 773 lockdep_assert_wiphy(sdata->local->hw.wiphy); 774 775 conn_flags = IEEE80211_CONN_DISABLE_VHT; 776 777 switch (ifibss->chandef.width) { 778 case NL80211_CHAN_WIDTH_5: 779 case NL80211_CHAN_WIDTH_10: 780 case NL80211_CHAN_WIDTH_20_NOHT: 781 conn_flags |= IEEE80211_CONN_DISABLE_HT; 782 fallthrough; 783 case NL80211_CHAN_WIDTH_20: 784 conn_flags |= IEEE80211_CONN_DISABLE_40MHZ; 785 break; 786 default: 787 break; 788 } 789 790 if (elems->vht_cap_elem) 791 vht_cap_info = le32_to_cpu(elems->vht_cap_elem->vht_cap_info); 792 793 memset(¶ms, 0, sizeof(params)); 794 err = ieee80211_parse_ch_switch_ie(sdata, elems, 795 ifibss->chandef.chan->band, 796 vht_cap_info, 797 conn_flags, ifibss->bssid, &csa_ie); 798 /* can't switch to destination channel, fail */ 799 if (err < 0) 800 goto disconnect; 801 802 /* did not contain a CSA */ 803 if (err) 804 return false; 805 806 /* channel switch is not supported, disconnect */ 807 if (!(sdata->local->hw.wiphy->flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH)) 808 goto disconnect; 809 810 params.count = csa_ie.count; 811 params.chandef = csa_ie.chandef; 812 813 switch (ifibss->chandef.width) { 814 case NL80211_CHAN_WIDTH_20_NOHT: 815 case NL80211_CHAN_WIDTH_20: 816 case NL80211_CHAN_WIDTH_40: 817 /* keep our current HT mode (HT20/HT40+/HT40-), even if 818 * another mode has been announced. The mode is not adopted 819 * within the beacon while doing CSA and we should therefore 820 * keep the mode which we announce. 821 */ 822 ch_type = cfg80211_get_chandef_type(&ifibss->chandef); 823 cfg80211_chandef_create(¶ms.chandef, params.chandef.chan, 824 ch_type); 825 break; 826 case NL80211_CHAN_WIDTH_5: 827 case NL80211_CHAN_WIDTH_10: 828 if (params.chandef.width != ifibss->chandef.width) { 829 sdata_info(sdata, 830 "IBSS %pM received channel switch from incompatible channel width (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 831 ifibss->bssid, 832 params.chandef.chan->center_freq, 833 params.chandef.width, 834 params.chandef.center_freq1, 835 params.chandef.center_freq2); 836 goto disconnect; 837 } 838 break; 839 default: 840 /* should not happen, conn_flags should prevent VHT modes. */ 841 WARN_ON(1); 842 goto disconnect; 843 } 844 845 if (!cfg80211_reg_can_beacon(sdata->local->hw.wiphy, ¶ms.chandef, 846 NL80211_IFTYPE_ADHOC)) { 847 sdata_info(sdata, 848 "IBSS %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n", 849 ifibss->bssid, 850 params.chandef.chan->center_freq, 851 params.chandef.width, 852 params.chandef.center_freq1, 853 params.chandef.center_freq2); 854 goto disconnect; 855 } 856 857 err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy, 858 ¶ms.chandef, 859 NL80211_IFTYPE_ADHOC); 860 if (err < 0) 861 goto disconnect; 862 if (err > 0 && !ifibss->userspace_handles_dfs) { 863 /* IBSS-DFS only allowed with a control program */ 864 goto disconnect; 865 } 866 867 params.radar_required = err; 868 869 if (cfg80211_chandef_identical(¶ms.chandef, 870 &sdata->vif.bss_conf.chandef)) { 871 ibss_dbg(sdata, 872 "received csa with an identical chandef, ignoring\n"); 873 return true; 874 } 875 876 /* all checks done, now perform the channel switch. */ 877 ibss_dbg(sdata, 878 "received channel switch announcement to go to channel %d MHz\n", 879 params.chandef.chan->center_freq); 880 881 params.block_tx = !!csa_ie.mode; 882 883 if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev, 884 ¶ms)) 885 goto disconnect; 886 887 ieee80211_ibss_csa_mark_radar(sdata); 888 889 return true; 890 disconnect: 891 ibss_dbg(sdata, "Can't handle channel switch, disconnect\n"); 892 wiphy_work_queue(sdata->local->hw.wiphy, 893 &ifibss->csa_connection_drop_work); 894 895 ieee80211_ibss_csa_mark_radar(sdata); 896 897 return true; 898 } 899 900 static void 901 ieee80211_rx_mgmt_spectrum_mgmt(struct ieee80211_sub_if_data *sdata, 902 struct ieee80211_mgmt *mgmt, size_t len, 903 struct ieee80211_rx_status *rx_status, 904 struct ieee802_11_elems *elems) 905 { 906 int required_len; 907 908 if (len < IEEE80211_MIN_ACTION_SIZE + 1) 909 return; 910 911 /* CSA is the only action we handle for now */ 912 if (mgmt->u.action.u.measurement.action_code != 913 WLAN_ACTION_SPCT_CHL_SWITCH) 914 return; 915 916 required_len = IEEE80211_MIN_ACTION_SIZE + 917 sizeof(mgmt->u.action.u.chan_switch); 918 if (len < required_len) 919 return; 920 921 if (!sdata->vif.bss_conf.csa_active) 922 ieee80211_ibss_process_chanswitch(sdata, elems, false); 923 } 924 925 static void ieee80211_rx_mgmt_deauth_ibss(struct ieee80211_sub_if_data *sdata, 926 struct ieee80211_mgmt *mgmt, 927 size_t len) 928 { 929 u16 reason = le16_to_cpu(mgmt->u.deauth.reason_code); 930 931 if (len < IEEE80211_DEAUTH_FRAME_LEN) 932 return; 933 934 ibss_dbg(sdata, "RX DeAuth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 935 ibss_dbg(sdata, "\tBSSID=%pM (reason: %d)\n", mgmt->bssid, reason); 936 sta_info_destroy_addr(sdata, mgmt->sa); 937 } 938 939 static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata, 940 struct ieee80211_mgmt *mgmt, 941 size_t len) 942 { 943 u16 auth_alg, auth_transaction; 944 945 lockdep_assert_wiphy(sdata->local->hw.wiphy); 946 947 if (len < 24 + 6) 948 return; 949 950 auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg); 951 auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction); 952 953 ibss_dbg(sdata, "RX Auth SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 954 ibss_dbg(sdata, "\tBSSID=%pM (auth_transaction=%d)\n", 955 mgmt->bssid, auth_transaction); 956 957 if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1) 958 return; 959 960 /* 961 * IEEE 802.11 standard does not require authentication in IBSS 962 * networks and most implementations do not seem to use it. 963 * However, try to reply to authentication attempts if someone 964 * has actually implemented this. 965 */ 966 ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, 0, NULL, 0, 967 mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0, 0); 968 } 969 970 static void ieee80211_update_sta_info(struct ieee80211_sub_if_data *sdata, 971 struct ieee80211_mgmt *mgmt, size_t len, 972 struct ieee80211_rx_status *rx_status, 973 struct ieee802_11_elems *elems, 974 struct ieee80211_channel *channel) 975 { 976 struct sta_info *sta; 977 enum nl80211_band band = rx_status->band; 978 enum nl80211_bss_scan_width scan_width; 979 struct ieee80211_local *local = sdata->local; 980 struct ieee80211_supported_band *sband; 981 bool rates_updated = false; 982 u32 supp_rates = 0; 983 984 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 985 return; 986 987 if (!ether_addr_equal(mgmt->bssid, sdata->u.ibss.bssid)) 988 return; 989 990 sband = local->hw.wiphy->bands[band]; 991 if (WARN_ON(!sband)) 992 return; 993 994 rcu_read_lock(); 995 sta = sta_info_get(sdata, mgmt->sa); 996 997 if (elems->supp_rates) { 998 supp_rates = ieee80211_sta_get_rates(sdata, elems, 999 band, NULL); 1000 if (sta) { 1001 u32 prev_rates; 1002 1003 prev_rates = sta->sta.deflink.supp_rates[band]; 1004 /* make sure mandatory rates are always added */ 1005 scan_width = NL80211_BSS_CHAN_WIDTH_20; 1006 if (rx_status->bw == RATE_INFO_BW_5) 1007 scan_width = NL80211_BSS_CHAN_WIDTH_5; 1008 else if (rx_status->bw == RATE_INFO_BW_10) 1009 scan_width = NL80211_BSS_CHAN_WIDTH_10; 1010 1011 sta->sta.deflink.supp_rates[band] = supp_rates | 1012 ieee80211_mandatory_rates(sband, scan_width); 1013 if (sta->sta.deflink.supp_rates[band] != prev_rates) { 1014 ibss_dbg(sdata, 1015 "updated supp_rates set for %pM based on beacon/probe_resp (0x%x -> 0x%x)\n", 1016 sta->sta.addr, prev_rates, 1017 sta->sta.deflink.supp_rates[band]); 1018 rates_updated = true; 1019 } 1020 } else { 1021 rcu_read_unlock(); 1022 sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, 1023 mgmt->sa, supp_rates); 1024 } 1025 } 1026 1027 if (sta && !sta->sta.wme && 1028 (elems->wmm_info || elems->s1g_capab) && 1029 local->hw.queues >= IEEE80211_NUM_ACS) { 1030 sta->sta.wme = true; 1031 ieee80211_check_fast_xmit(sta); 1032 } 1033 1034 if (sta && elems->ht_operation && elems->ht_cap_elem && 1035 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20_NOHT && 1036 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_5 && 1037 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_10) { 1038 /* we both use HT */ 1039 struct ieee80211_ht_cap htcap_ie; 1040 struct cfg80211_chan_def chandef; 1041 enum ieee80211_sta_rx_bandwidth bw = sta->sta.deflink.bandwidth; 1042 1043 cfg80211_chandef_create(&chandef, channel, NL80211_CHAN_NO_HT); 1044 ieee80211_chandef_ht_oper(elems->ht_operation, &chandef); 1045 1046 memcpy(&htcap_ie, elems->ht_cap_elem, sizeof(htcap_ie)); 1047 rates_updated |= ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, 1048 &htcap_ie, 1049 &sta->deflink); 1050 1051 if (elems->vht_operation && elems->vht_cap_elem && 1052 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_20 && 1053 sdata->u.ibss.chandef.width != NL80211_CHAN_WIDTH_40) { 1054 /* we both use VHT */ 1055 struct ieee80211_vht_cap cap_ie; 1056 struct ieee80211_sta_vht_cap cap = sta->sta.deflink.vht_cap; 1057 u32 vht_cap_info = 1058 le32_to_cpu(elems->vht_cap_elem->vht_cap_info); 1059 1060 ieee80211_chandef_vht_oper(&local->hw, vht_cap_info, 1061 elems->vht_operation, 1062 elems->ht_operation, 1063 &chandef); 1064 memcpy(&cap_ie, elems->vht_cap_elem, sizeof(cap_ie)); 1065 ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband, 1066 &cap_ie, 1067 &sta->deflink); 1068 if (memcmp(&cap, &sta->sta.deflink.vht_cap, sizeof(cap))) 1069 rates_updated |= true; 1070 } 1071 1072 if (bw != sta->sta.deflink.bandwidth) 1073 rates_updated |= true; 1074 1075 if (!cfg80211_chandef_compatible(&sdata->u.ibss.chandef, 1076 &chandef)) 1077 WARN_ON_ONCE(1); 1078 } 1079 1080 if (sta && rates_updated) { 1081 u32 changed = IEEE80211_RC_SUPP_RATES_CHANGED; 1082 u8 rx_nss = sta->sta.deflink.rx_nss; 1083 1084 /* Force rx_nss recalculation */ 1085 sta->sta.deflink.rx_nss = 0; 1086 rate_control_rate_init(sta); 1087 if (sta->sta.deflink.rx_nss != rx_nss) 1088 changed |= IEEE80211_RC_NSS_CHANGED; 1089 1090 drv_sta_rc_update(local, sdata, &sta->sta, changed); 1091 } 1092 1093 rcu_read_unlock(); 1094 } 1095 1096 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, 1097 struct ieee80211_mgmt *mgmt, size_t len, 1098 struct ieee80211_rx_status *rx_status, 1099 struct ieee802_11_elems *elems) 1100 { 1101 struct ieee80211_local *local = sdata->local; 1102 struct cfg80211_bss *cbss; 1103 struct ieee80211_bss *bss; 1104 struct ieee80211_channel *channel; 1105 u64 beacon_timestamp, rx_timestamp; 1106 u32 supp_rates = 0; 1107 enum nl80211_band band = rx_status->band; 1108 1109 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq); 1110 if (!channel) 1111 return; 1112 1113 ieee80211_update_sta_info(sdata, mgmt, len, rx_status, elems, channel); 1114 1115 bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, channel); 1116 if (!bss) 1117 return; 1118 1119 cbss = container_of((void *)bss, struct cfg80211_bss, priv); 1120 1121 /* same for beacon and probe response */ 1122 beacon_timestamp = le64_to_cpu(mgmt->u.beacon.timestamp); 1123 1124 /* check if we need to merge IBSS */ 1125 1126 /* not an IBSS */ 1127 if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) 1128 goto put_bss; 1129 1130 /* different channel */ 1131 if (sdata->u.ibss.fixed_channel && 1132 sdata->u.ibss.chandef.chan != cbss->channel) 1133 goto put_bss; 1134 1135 /* different SSID */ 1136 if (elems->ssid_len != sdata->u.ibss.ssid_len || 1137 memcmp(elems->ssid, sdata->u.ibss.ssid, 1138 sdata->u.ibss.ssid_len)) 1139 goto put_bss; 1140 1141 /* process channel switch */ 1142 if (sdata->vif.bss_conf.csa_active || 1143 ieee80211_ibss_process_chanswitch(sdata, elems, true)) 1144 goto put_bss; 1145 1146 /* same BSSID */ 1147 if (ether_addr_equal(cbss->bssid, sdata->u.ibss.bssid)) 1148 goto put_bss; 1149 1150 /* we use a fixed BSSID */ 1151 if (sdata->u.ibss.fixed_bssid) 1152 goto put_bss; 1153 1154 if (ieee80211_have_rx_timestamp(rx_status)) { 1155 /* time when timestamp field was received */ 1156 rx_timestamp = 1157 ieee80211_calculate_rx_timestamp(local, rx_status, 1158 len + FCS_LEN, 24); 1159 } else { 1160 /* 1161 * second best option: get current TSF 1162 * (will return -1 if not supported) 1163 */ 1164 rx_timestamp = drv_get_tsf(local, sdata); 1165 } 1166 1167 ibss_dbg(sdata, "RX beacon SA=%pM BSSID=%pM TSF=0x%llx\n", 1168 mgmt->sa, mgmt->bssid, 1169 (unsigned long long)rx_timestamp); 1170 ibss_dbg(sdata, "\tBCN=0x%llx diff=%lld @%lu\n", 1171 (unsigned long long)beacon_timestamp, 1172 (unsigned long long)(rx_timestamp - beacon_timestamp), 1173 jiffies); 1174 1175 if (beacon_timestamp > rx_timestamp) { 1176 ibss_dbg(sdata, 1177 "beacon TSF higher than local TSF - IBSS merge with BSSID %pM\n", 1178 mgmt->bssid); 1179 ieee80211_sta_join_ibss(sdata, bss); 1180 supp_rates = ieee80211_sta_get_rates(sdata, elems, band, NULL); 1181 ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 1182 supp_rates); 1183 rcu_read_unlock(); 1184 } 1185 1186 put_bss: 1187 ieee80211_rx_bss_put(local, bss); 1188 } 1189 1190 void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata, 1191 const u8 *bssid, const u8 *addr, 1192 u32 supp_rates) 1193 { 1194 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1195 struct ieee80211_local *local = sdata->local; 1196 struct sta_info *sta; 1197 struct ieee80211_chanctx_conf *chanctx_conf; 1198 struct ieee80211_supported_band *sband; 1199 enum nl80211_bss_scan_width scan_width; 1200 int band; 1201 1202 /* 1203 * XXX: Consider removing the least recently used entry and 1204 * allow new one to be added. 1205 */ 1206 if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) { 1207 net_info_ratelimited("%s: No room for a new IBSS STA entry %pM\n", 1208 sdata->name, addr); 1209 return; 1210 } 1211 1212 if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) 1213 return; 1214 1215 if (!ether_addr_equal(bssid, sdata->u.ibss.bssid)) 1216 return; 1217 1218 rcu_read_lock(); 1219 chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf); 1220 if (WARN_ON_ONCE(!chanctx_conf)) { 1221 rcu_read_unlock(); 1222 return; 1223 } 1224 band = chanctx_conf->def.chan->band; 1225 scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def); 1226 rcu_read_unlock(); 1227 1228 sta = sta_info_alloc(sdata, addr, GFP_ATOMIC); 1229 if (!sta) 1230 return; 1231 1232 /* make sure mandatory rates are always added */ 1233 sband = local->hw.wiphy->bands[band]; 1234 sta->sta.deflink.supp_rates[band] = supp_rates | 1235 ieee80211_mandatory_rates(sband, scan_width); 1236 1237 spin_lock(&ifibss->incomplete_lock); 1238 list_add(&sta->list, &ifibss->incomplete_stations); 1239 spin_unlock(&ifibss->incomplete_lock); 1240 wiphy_work_queue(local->hw.wiphy, &sdata->work); 1241 } 1242 1243 static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata) 1244 { 1245 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1246 struct ieee80211_local *local = sdata->local; 1247 struct sta_info *sta, *tmp; 1248 unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT; 1249 unsigned long exp_rsn = IEEE80211_IBSS_RSN_INACTIVITY_LIMIT; 1250 1251 lockdep_assert_wiphy(local->hw.wiphy); 1252 1253 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { 1254 unsigned long last_active = ieee80211_sta_last_active(sta); 1255 1256 if (sdata != sta->sdata) 1257 continue; 1258 1259 if (time_is_before_jiffies(last_active + exp_time) || 1260 (time_is_before_jiffies(last_active + exp_rsn) && 1261 sta->sta_state != IEEE80211_STA_AUTHORIZED)) { 1262 u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN]; 1263 1264 sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n", 1265 sta->sta_state != IEEE80211_STA_AUTHORIZED ? 1266 "not authorized " : "", sta->sta.addr); 1267 1268 ieee80211_send_deauth_disassoc(sdata, sta->sta.addr, 1269 ifibss->bssid, 1270 IEEE80211_STYPE_DEAUTH, 1271 WLAN_REASON_DEAUTH_LEAVING, 1272 true, frame_buf); 1273 WARN_ON(__sta_info_destroy(sta)); 1274 } 1275 } 1276 } 1277 1278 /* 1279 * This function is called with state == IEEE80211_IBSS_MLME_JOINED 1280 */ 1281 1282 static void ieee80211_sta_merge_ibss(struct ieee80211_sub_if_data *sdata) 1283 { 1284 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1285 enum nl80211_bss_scan_width scan_width; 1286 1287 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1288 1289 mod_timer(&ifibss->timer, 1290 round_jiffies(jiffies + IEEE80211_IBSS_MERGE_INTERVAL)); 1291 1292 ieee80211_ibss_sta_expire(sdata); 1293 1294 if (time_before(jiffies, ifibss->last_scan_completed + 1295 IEEE80211_IBSS_MERGE_INTERVAL)) 1296 return; 1297 1298 if (ieee80211_sta_active_ibss(sdata)) 1299 return; 1300 1301 if (ifibss->fixed_channel) 1302 return; 1303 1304 sdata_info(sdata, 1305 "No active IBSS STAs - trying to scan for other IBSS networks with same SSID (merge)\n"); 1306 1307 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 1308 ieee80211_request_ibss_scan(sdata, ifibss->ssid, ifibss->ssid_len, 1309 NULL, 0, scan_width); 1310 } 1311 1312 static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata) 1313 { 1314 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1315 u8 bssid[ETH_ALEN]; 1316 u16 capability; 1317 int i; 1318 1319 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1320 1321 if (ifibss->fixed_bssid) { 1322 memcpy(bssid, ifibss->bssid, ETH_ALEN); 1323 } else { 1324 /* Generate random, not broadcast, locally administered BSSID. Mix in 1325 * own MAC address to make sure that devices that do not have proper 1326 * random number generator get different BSSID. */ 1327 get_random_bytes(bssid, ETH_ALEN); 1328 for (i = 0; i < ETH_ALEN; i++) 1329 bssid[i] ^= sdata->vif.addr[i]; 1330 bssid[0] &= ~0x01; 1331 bssid[0] |= 0x02; 1332 } 1333 1334 sdata_info(sdata, "Creating new IBSS network, BSSID %pM\n", bssid); 1335 1336 capability = WLAN_CAPABILITY_IBSS; 1337 1338 if (ifibss->privacy) 1339 capability |= WLAN_CAPABILITY_PRIVACY; 1340 1341 __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int, 1342 &ifibss->chandef, ifibss->basic_rates, 1343 capability, 0, true); 1344 } 1345 1346 static unsigned int ibss_setup_channels(struct wiphy *wiphy, 1347 struct ieee80211_channel **channels, 1348 unsigned int channels_max, 1349 u32 center_freq, u32 width) 1350 { 1351 struct ieee80211_channel *chan = NULL; 1352 unsigned int n_chan = 0; 1353 u32 start_freq, end_freq, freq; 1354 1355 if (width <= 20) { 1356 start_freq = center_freq; 1357 end_freq = center_freq; 1358 } else { 1359 start_freq = center_freq - width / 2 + 10; 1360 end_freq = center_freq + width / 2 - 10; 1361 } 1362 1363 for (freq = start_freq; freq <= end_freq; freq += 20) { 1364 chan = ieee80211_get_channel(wiphy, freq); 1365 if (!chan) 1366 continue; 1367 if (n_chan >= channels_max) 1368 return n_chan; 1369 1370 channels[n_chan] = chan; 1371 n_chan++; 1372 } 1373 1374 return n_chan; 1375 } 1376 1377 static unsigned int 1378 ieee80211_ibss_setup_scan_channels(struct wiphy *wiphy, 1379 const struct cfg80211_chan_def *chandef, 1380 struct ieee80211_channel **channels, 1381 unsigned int channels_max) 1382 { 1383 unsigned int n_chan = 0; 1384 u32 width, cf1, cf2 = 0; 1385 1386 switch (chandef->width) { 1387 case NL80211_CHAN_WIDTH_40: 1388 width = 40; 1389 break; 1390 case NL80211_CHAN_WIDTH_80P80: 1391 cf2 = chandef->center_freq2; 1392 fallthrough; 1393 case NL80211_CHAN_WIDTH_80: 1394 width = 80; 1395 break; 1396 case NL80211_CHAN_WIDTH_160: 1397 width = 160; 1398 break; 1399 default: 1400 width = 20; 1401 break; 1402 } 1403 1404 cf1 = chandef->center_freq1; 1405 1406 n_chan = ibss_setup_channels(wiphy, channels, channels_max, cf1, width); 1407 1408 if (cf2) 1409 n_chan += ibss_setup_channels(wiphy, &channels[n_chan], 1410 channels_max - n_chan, cf2, 1411 width); 1412 1413 return n_chan; 1414 } 1415 1416 /* 1417 * This function is called with state == IEEE80211_IBSS_MLME_SEARCH 1418 */ 1419 1420 static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata) 1421 { 1422 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1423 struct ieee80211_local *local = sdata->local; 1424 struct cfg80211_bss *cbss; 1425 struct ieee80211_channel *chan = NULL; 1426 const u8 *bssid = NULL; 1427 enum nl80211_bss_scan_width scan_width; 1428 int active_ibss; 1429 1430 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1431 1432 active_ibss = ieee80211_sta_active_ibss(sdata); 1433 ibss_dbg(sdata, "sta_find_ibss (active_ibss=%d)\n", active_ibss); 1434 1435 if (active_ibss) 1436 return; 1437 1438 if (ifibss->fixed_bssid) 1439 bssid = ifibss->bssid; 1440 if (ifibss->fixed_channel) 1441 chan = ifibss->chandef.chan; 1442 if (!is_zero_ether_addr(ifibss->bssid)) 1443 bssid = ifibss->bssid; 1444 cbss = cfg80211_get_bss(local->hw.wiphy, chan, bssid, 1445 ifibss->ssid, ifibss->ssid_len, 1446 IEEE80211_BSS_TYPE_IBSS, 1447 IEEE80211_PRIVACY(ifibss->privacy)); 1448 1449 if (cbss) { 1450 struct ieee80211_bss *bss; 1451 1452 bss = (void *)cbss->priv; 1453 ibss_dbg(sdata, 1454 "sta_find_ibss: selected %pM current %pM\n", 1455 cbss->bssid, ifibss->bssid); 1456 sdata_info(sdata, 1457 "Selected IBSS BSSID %pM based on configured SSID\n", 1458 cbss->bssid); 1459 1460 ieee80211_sta_join_ibss(sdata, bss); 1461 ieee80211_rx_bss_put(local, bss); 1462 return; 1463 } 1464 1465 /* if a fixed bssid and a fixed freq have been provided create the IBSS 1466 * directly and do not waste time scanning 1467 */ 1468 if (ifibss->fixed_bssid && ifibss->fixed_channel) { 1469 sdata_info(sdata, "Created IBSS using preconfigured BSSID %pM\n", 1470 bssid); 1471 ieee80211_sta_create_ibss(sdata); 1472 return; 1473 } 1474 1475 1476 ibss_dbg(sdata, "sta_find_ibss: did not try to join ibss\n"); 1477 1478 /* Selected IBSS not found in current scan results - try to scan */ 1479 if (time_after(jiffies, ifibss->last_scan_completed + 1480 IEEE80211_SCAN_INTERVAL)) { 1481 struct ieee80211_channel *channels[8]; 1482 unsigned int num; 1483 1484 sdata_info(sdata, "Trigger new scan to find an IBSS to join\n"); 1485 1486 scan_width = cfg80211_chandef_to_scan_width(&ifibss->chandef); 1487 1488 if (ifibss->fixed_channel) { 1489 num = ieee80211_ibss_setup_scan_channels(local->hw.wiphy, 1490 &ifibss->chandef, 1491 channels, 1492 ARRAY_SIZE(channels)); 1493 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1494 ifibss->ssid_len, channels, 1495 num, scan_width); 1496 } else { 1497 ieee80211_request_ibss_scan(sdata, ifibss->ssid, 1498 ifibss->ssid_len, NULL, 1499 0, scan_width); 1500 } 1501 } else { 1502 int interval = IEEE80211_SCAN_INTERVAL; 1503 1504 if (time_after(jiffies, ifibss->ibss_join_req + 1505 IEEE80211_IBSS_JOIN_TIMEOUT)) 1506 ieee80211_sta_create_ibss(sdata); 1507 1508 mod_timer(&ifibss->timer, 1509 round_jiffies(jiffies + interval)); 1510 } 1511 } 1512 1513 static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata, 1514 struct sk_buff *req) 1515 { 1516 struct ieee80211_mgmt *mgmt = (void *)req->data; 1517 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1518 struct ieee80211_local *local = sdata->local; 1519 int tx_last_beacon, len = req->len; 1520 struct sk_buff *skb; 1521 struct beacon_data *presp; 1522 u8 *pos, *end; 1523 1524 lockdep_assert_wiphy(sdata->local->hw.wiphy); 1525 1526 presp = sdata_dereference(ifibss->presp, sdata); 1527 1528 if (ifibss->state != IEEE80211_IBSS_MLME_JOINED || 1529 len < 24 + 2 || !presp) 1530 return; 1531 1532 tx_last_beacon = drv_tx_last_beacon(local); 1533 1534 ibss_dbg(sdata, "RX ProbeReq SA=%pM DA=%pM\n", mgmt->sa, mgmt->da); 1535 ibss_dbg(sdata, "\tBSSID=%pM (tx_last_beacon=%d)\n", 1536 mgmt->bssid, tx_last_beacon); 1537 1538 if (!tx_last_beacon && is_multicast_ether_addr(mgmt->da)) 1539 return; 1540 1541 if (!ether_addr_equal(mgmt->bssid, ifibss->bssid) && 1542 !is_broadcast_ether_addr(mgmt->bssid)) 1543 return; 1544 1545 end = ((u8 *) mgmt) + len; 1546 pos = mgmt->u.probe_req.variable; 1547 if (pos[0] != WLAN_EID_SSID || 1548 pos + 2 + pos[1] > end) { 1549 ibss_dbg(sdata, "Invalid SSID IE in ProbeReq from %pM\n", 1550 mgmt->sa); 1551 return; 1552 } 1553 if (pos[1] != 0 && 1554 (pos[1] != ifibss->ssid_len || 1555 memcmp(pos + 2, ifibss->ssid, ifibss->ssid_len))) { 1556 /* Ignore ProbeReq for foreign SSID */ 1557 return; 1558 } 1559 1560 /* Reply with ProbeResp */ 1561 skb = dev_alloc_skb(local->tx_headroom + presp->head_len); 1562 if (!skb) 1563 return; 1564 1565 skb_reserve(skb, local->tx_headroom); 1566 skb_put_data(skb, presp->head, presp->head_len); 1567 1568 memcpy(((struct ieee80211_mgmt *) skb->data)->da, mgmt->sa, ETH_ALEN); 1569 ibss_dbg(sdata, "Sending ProbeResp to %pM\n", mgmt->sa); 1570 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; 1571 1572 /* avoid excessive retries for probe request to wildcard SSIDs */ 1573 if (pos[1] == 0) 1574 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_NO_ACK; 1575 1576 ieee80211_tx_skb(sdata, skb); 1577 } 1578 1579 static 1580 void ieee80211_rx_mgmt_probe_beacon(struct ieee80211_sub_if_data *sdata, 1581 struct ieee80211_mgmt *mgmt, size_t len, 1582 struct ieee80211_rx_status *rx_status) 1583 { 1584 size_t baselen; 1585 struct ieee802_11_elems *elems; 1586 1587 BUILD_BUG_ON(offsetof(typeof(mgmt->u.probe_resp), variable) != 1588 offsetof(typeof(mgmt->u.beacon), variable)); 1589 1590 /* 1591 * either beacon or probe_resp but the variable field is at the 1592 * same offset 1593 */ 1594 baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt; 1595 if (baselen > len) 1596 return; 1597 1598 elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable, 1599 len - baselen, false, NULL); 1600 1601 if (elems) { 1602 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, elems); 1603 kfree(elems); 1604 } 1605 } 1606 1607 void ieee80211_ibss_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata, 1608 struct sk_buff *skb) 1609 { 1610 struct ieee80211_rx_status *rx_status; 1611 struct ieee80211_mgmt *mgmt; 1612 u16 fc; 1613 struct ieee802_11_elems *elems; 1614 int ies_len; 1615 1616 rx_status = IEEE80211_SKB_RXCB(skb); 1617 mgmt = (struct ieee80211_mgmt *) skb->data; 1618 fc = le16_to_cpu(mgmt->frame_control); 1619 1620 if (!sdata->u.ibss.ssid_len) 1621 return; /* not ready to merge yet */ 1622 1623 switch (fc & IEEE80211_FCTL_STYPE) { 1624 case IEEE80211_STYPE_PROBE_REQ: 1625 ieee80211_rx_mgmt_probe_req(sdata, skb); 1626 break; 1627 case IEEE80211_STYPE_PROBE_RESP: 1628 case IEEE80211_STYPE_BEACON: 1629 ieee80211_rx_mgmt_probe_beacon(sdata, mgmt, skb->len, 1630 rx_status); 1631 break; 1632 case IEEE80211_STYPE_AUTH: 1633 ieee80211_rx_mgmt_auth_ibss(sdata, mgmt, skb->len); 1634 break; 1635 case IEEE80211_STYPE_DEAUTH: 1636 ieee80211_rx_mgmt_deauth_ibss(sdata, mgmt, skb->len); 1637 break; 1638 case IEEE80211_STYPE_ACTION: 1639 switch (mgmt->u.action.category) { 1640 case WLAN_CATEGORY_SPECTRUM_MGMT: 1641 ies_len = skb->len - 1642 offsetof(struct ieee80211_mgmt, 1643 u.action.u.chan_switch.variable); 1644 1645 if (ies_len < 0) 1646 break; 1647 1648 elems = ieee802_11_parse_elems( 1649 mgmt->u.action.u.chan_switch.variable, 1650 ies_len, true, NULL); 1651 1652 if (elems && !elems->parse_error) 1653 ieee80211_rx_mgmt_spectrum_mgmt(sdata, mgmt, 1654 skb->len, 1655 rx_status, 1656 elems); 1657 kfree(elems); 1658 break; 1659 } 1660 } 1661 } 1662 1663 void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata) 1664 { 1665 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1666 struct sta_info *sta; 1667 1668 /* 1669 * Work could be scheduled after scan or similar 1670 * when we aren't even joined (or trying) with a 1671 * network. 1672 */ 1673 if (!ifibss->ssid_len) 1674 return; 1675 1676 spin_lock_bh(&ifibss->incomplete_lock); 1677 while (!list_empty(&ifibss->incomplete_stations)) { 1678 sta = list_first_entry(&ifibss->incomplete_stations, 1679 struct sta_info, list); 1680 list_del(&sta->list); 1681 spin_unlock_bh(&ifibss->incomplete_lock); 1682 1683 ieee80211_ibss_finish_sta(sta); 1684 rcu_read_unlock(); 1685 spin_lock_bh(&ifibss->incomplete_lock); 1686 } 1687 spin_unlock_bh(&ifibss->incomplete_lock); 1688 1689 switch (ifibss->state) { 1690 case IEEE80211_IBSS_MLME_SEARCH: 1691 ieee80211_sta_find_ibss(sdata); 1692 break; 1693 case IEEE80211_IBSS_MLME_JOINED: 1694 ieee80211_sta_merge_ibss(sdata); 1695 break; 1696 default: 1697 WARN_ON(1); 1698 break; 1699 } 1700 } 1701 1702 static void ieee80211_ibss_timer(struct timer_list *t) 1703 { 1704 struct ieee80211_sub_if_data *sdata = 1705 from_timer(sdata, t, u.ibss.timer); 1706 1707 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work); 1708 } 1709 1710 void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata) 1711 { 1712 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1713 1714 timer_setup(&ifibss->timer, ieee80211_ibss_timer, 0); 1715 INIT_LIST_HEAD(&ifibss->incomplete_stations); 1716 spin_lock_init(&ifibss->incomplete_lock); 1717 wiphy_work_init(&ifibss->csa_connection_drop_work, 1718 ieee80211_csa_connection_drop_work); 1719 } 1720 1721 /* scan finished notification */ 1722 void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local) 1723 { 1724 struct ieee80211_sub_if_data *sdata; 1725 1726 lockdep_assert_wiphy(local->hw.wiphy); 1727 1728 list_for_each_entry(sdata, &local->interfaces, list) { 1729 if (!ieee80211_sdata_running(sdata)) 1730 continue; 1731 if (sdata->vif.type != NL80211_IFTYPE_ADHOC) 1732 continue; 1733 sdata->u.ibss.last_scan_completed = jiffies; 1734 } 1735 } 1736 1737 int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata, 1738 struct cfg80211_ibss_params *params) 1739 { 1740 u64 changed = 0; 1741 u32 rate_flags; 1742 struct ieee80211_supported_band *sband; 1743 enum ieee80211_chanctx_mode chanmode; 1744 struct ieee80211_local *local = sdata->local; 1745 int radar_detect_width = 0; 1746 int i; 1747 int ret; 1748 1749 lockdep_assert_wiphy(local->hw.wiphy); 1750 1751 if (params->chandef.chan->freq_offset) { 1752 /* this may work, but is untested */ 1753 return -EOPNOTSUPP; 1754 } 1755 1756 ret = cfg80211_chandef_dfs_required(local->hw.wiphy, 1757 ¶ms->chandef, 1758 sdata->wdev.iftype); 1759 if (ret < 0) 1760 return ret; 1761 1762 if (ret > 0) { 1763 if (!params->userspace_handles_dfs) 1764 return -EINVAL; 1765 radar_detect_width = BIT(params->chandef.width); 1766 } 1767 1768 chanmode = (params->channel_fixed && !ret) ? 1769 IEEE80211_CHANCTX_SHARED : IEEE80211_CHANCTX_EXCLUSIVE; 1770 1771 ret = ieee80211_check_combinations(sdata, ¶ms->chandef, chanmode, 1772 radar_detect_width); 1773 if (ret < 0) 1774 return ret; 1775 1776 if (params->bssid) { 1777 memcpy(sdata->u.ibss.bssid, params->bssid, ETH_ALEN); 1778 sdata->u.ibss.fixed_bssid = true; 1779 } else 1780 sdata->u.ibss.fixed_bssid = false; 1781 1782 sdata->u.ibss.privacy = params->privacy; 1783 sdata->u.ibss.control_port = params->control_port; 1784 sdata->u.ibss.userspace_handles_dfs = params->userspace_handles_dfs; 1785 sdata->u.ibss.basic_rates = params->basic_rates; 1786 sdata->u.ibss.last_scan_completed = jiffies; 1787 1788 /* fix basic_rates if channel does not support these rates */ 1789 rate_flags = ieee80211_chandef_rate_flags(¶ms->chandef); 1790 sband = local->hw.wiphy->bands[params->chandef.chan->band]; 1791 for (i = 0; i < sband->n_bitrates; i++) { 1792 if ((rate_flags & sband->bitrates[i].flags) != rate_flags) 1793 sdata->u.ibss.basic_rates &= ~BIT(i); 1794 } 1795 memcpy(sdata->vif.bss_conf.mcast_rate, params->mcast_rate, 1796 sizeof(params->mcast_rate)); 1797 1798 sdata->vif.bss_conf.beacon_int = params->beacon_interval; 1799 1800 sdata->u.ibss.chandef = params->chandef; 1801 sdata->u.ibss.fixed_channel = params->channel_fixed; 1802 1803 if (params->ie) { 1804 sdata->u.ibss.ie = kmemdup(params->ie, params->ie_len, 1805 GFP_KERNEL); 1806 if (sdata->u.ibss.ie) 1807 sdata->u.ibss.ie_len = params->ie_len; 1808 } 1809 1810 sdata->u.ibss.state = IEEE80211_IBSS_MLME_SEARCH; 1811 sdata->u.ibss.ibss_join_req = jiffies; 1812 1813 memcpy(sdata->u.ibss.ssid, params->ssid, params->ssid_len); 1814 sdata->u.ibss.ssid_len = params->ssid_len; 1815 1816 memcpy(&sdata->u.ibss.ht_capa, ¶ms->ht_capa, 1817 sizeof(sdata->u.ibss.ht_capa)); 1818 memcpy(&sdata->u.ibss.ht_capa_mask, ¶ms->ht_capa_mask, 1819 sizeof(sdata->u.ibss.ht_capa_mask)); 1820 1821 /* 1822 * 802.11n-2009 9.13.3.1: In an IBSS, the HT Protection field is 1823 * reserved, but an HT STA shall protect HT transmissions as though 1824 * the HT Protection field were set to non-HT mixed mode. 1825 * 1826 * In an IBSS, the RIFS Mode field of the HT Operation element is 1827 * also reserved, but an HT STA shall operate as though this field 1828 * were set to 1. 1829 */ 1830 1831 sdata->vif.bss_conf.ht_operation_mode |= 1832 IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED 1833 | IEEE80211_HT_PARAM_RIFS_MODE; 1834 1835 changed |= BSS_CHANGED_HT | BSS_CHANGED_MCAST_RATE; 1836 ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed); 1837 1838 sdata->deflink.smps_mode = IEEE80211_SMPS_OFF; 1839 sdata->deflink.needed_rx_chains = local->rx_chains; 1840 sdata->control_port_over_nl80211 = params->control_port_over_nl80211; 1841 1842 wiphy_work_queue(local->hw.wiphy, &sdata->work); 1843 1844 return 0; 1845 } 1846 1847 int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata) 1848 { 1849 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; 1850 1851 ieee80211_ibss_disconnect(sdata); 1852 ifibss->ssid_len = 0; 1853 eth_zero_addr(ifibss->bssid); 1854 1855 /* remove beacon */ 1856 kfree(sdata->u.ibss.ie); 1857 sdata->u.ibss.ie = NULL; 1858 sdata->u.ibss.ie_len = 0; 1859 1860 /* on the next join, re-program HT parameters */ 1861 memset(&ifibss->ht_capa, 0, sizeof(ifibss->ht_capa)); 1862 memset(&ifibss->ht_capa_mask, 0, sizeof(ifibss->ht_capa_mask)); 1863 1864 synchronize_rcu(); 1865 1866 skb_queue_purge(&sdata->skb_queue); 1867 1868 del_timer_sync(&sdata->u.ibss.timer); 1869 1870 return 0; 1871 } 1872